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  J0453+1559: A neutron star–white dwarf binary from a thermonuclear electron-capture supernova?

Tauris, T. M., & Janka, H.-T. (2019). J0453+1559: A neutron star–white dwarf binary from a thermonuclear electron-capture supernova? The Astrophysical Journal Letters, 886(2): L20. doi:10.3847/2041-8213/ab5642.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-6258-A Version Permalink: http://hdl.handle.net/21.11116/0000-0005-6259-9
Genre: Journal Article

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J0453+1559 A Neutron Star–White Dwarf Binary from a Thermonuclear Electron-capture Supernova.pdf (Any fulltext), 622KB
 
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 Creators:
Tauris, Thomas M., Author
Janka, Hans-Thomas1, Author              
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1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: The compact binary radio pulsar system J0453+1559 consists of a recycled pulsar as primary component of 1.559(5) M and an unseen companion star of 1.174(4) M . Because of the relatively large orbital eccentricity of e = 0.1125, it was argued that the companion is a neutron star (NS), making it the NS with the lowest accurately determined mass to date. However, a direct observational determination of the nature of the companion is currently not feasible. Moreover, state-of-the-art stellar evolution and supernova modeling are contradictory concerning the possibility of producing such a low-mass NS remnant. Here we challenge the NS interpretation by reasoning that the lower-mass component could instead be a white dwarf born in a thermonuclear electron-capture supernova (tECSN) event, in which oxygen–neon deflagration in the degenerate stellar core of an ultra-stripped progenitor ejects several 0.1 M of matter and leaves a bound ONeFe white dwarf as the second-formed compact remnant. We determine the ejecta mass and remnant kick needed in this scenario to explain the properties of PSR J0453+1559 by a NS–white dwarf system. More work on tECSNe is needed to assess the viability of this scenario.

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 Dates: 2019-11-20
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/2041-8213/ab5642
Other: LOCALID: 3183311
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Title: The Astrophysical Journal Letters
  Other : Astrophys. J. Lett.
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 886 (2) Sequence Number: L20 Start / End Page: - Identifier: ISSN: 2041-8205
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215